TM  10-3930-643-34 ENGINE,  FUEL,  EXHAUST  AND 4-6. Rocker  Arm  Assembly ADJUSTMENT COOLING   TROUBLESHOOTING and Valve Cover. (Sheet 28. Using a flat tip screwdriver, a 9/16” open end wrench and a feeler gage, adjust rocker arm numbers 1, 2, 3, 6, 7 and 10 in top of engine, refer to Valve  Lash  Adjustment  Chart. 29. Turn crankshaft on bottom, rear of engine until No. 6 piston is at TDC (compression)  which  is  one  complete revolution  of  vibration  damper, 30. Adjust rocker arm numbers 4, 5, 8, 9, 11 and 12, refer to Valve Lash Adjustment  Chart. 31. Using a flat tip screwdriver, a 9/16” open end wrench and a feeler gage, tighten 12 nuts (26) to 20 lb-ft. NOTE If valve are in correct adjustment, proceed  to  installation. INSTALLATION 32. Using a 1/2”   socket and socket wrench handle,    install new gasket (13), access  cover  (12),  new  preformed packing (11), stud (10), five new preformed packing (9) and bolts (8). Tighten bolts (8) and stud (10) to 26 lb-ft. 33. Position hose assembly (7) and using a 1/2” socket and socket wrench handle, install clamp (6), washer (5) and nut (4). 34. Install tube assembly (3). 35. Using  a  flat  tip  screwdriver,  tighten clamps (2 and 1). NOTE AND MAINTENANCE. 9 of 9) Return M10A Forklift to original END OF TASK equipment  condition. 4-59